Originally Posted by
kipper
I was going to suggest this as well.
Dovster , if you think sending Czech Koruna to you via mail is a decent option, won't cause issues with customs, and if I send it in April, it will get there before her trip, I have some in my storage unit and can stop by there after my LIS trip to get it. We can figure out how you can repay me.

Before you send anything please check that it's still spendable currency.
From July 2022 Czech banknotes with a thin foil strip are no longer valid for spending. Only banknotes with a thick foil strip are valid. If your last visit was before July 2022 you may have some invalid bills.
The difference can be seen here:
P-18 Only the last one is spendable.
The old notes can be exchanged at banks until June 2024 and then the Czech central bank forever. It's quite easy to do the exchange, but maybe not for a 15 year old.